G'day,
Imperial
Materials List (inc masts, beams, rudders and booms. Does not include wastage, paint, consumables or safety gear)
12 ounce double bias fibreglass: 4,360 sq'
Very interesting discussion the last week or so. I have been flat out getting the 40F onto the web page and sorting out Bucket list, which is on target to be delivered here in mid July, sailing soon after. At which time it is open house for any of you who wants to come for a sail.
>From the last few posts:
Thanks Rick for the helpful numbers and advice. Hope the little tri cleans up the R2AK. Do those beams get some carbon on them?
Love the Bug! keep the drawings coming.
The Campaen rudders and support are big and heavy. The Luca Antara ones are considerably cleaner and lighter, and the C60, cleaner and lighter again. Neither rotate through 360 degrees which is a shortcoming, but offset by the advantages, I think. Bucket List's do it all, but are on the beams, which has a lot of disadvantages for the cruising harrys.
Stub masts are heavier and the top bearing is inaccessible, although the mast is shorter and the hole in the deck is sealed. Plus, with some detailed engineering, the halyards can be bought out through it above the deck, independant of how much the mast is rotated.
A single piece mast is cheaper, lighter and sealing the deck against rain and spray is pretty trivial.
On Bucket List, I am trying a non rotating mast (no bearings or alignment required) and no track. Both significant time and money savings. It will sit in a sleeve to keep the water out. The sleeve is beefed up top and bottom and glued into holes in the hull to help hold the hull halves together. The rest of it is only to keep the water out. For long term use, this is not totally satisfactory as stuff will grow in the tube and it will smell. It is very simple to build and install though. Pictures of this on the blog 'soon'.
Bury is determined by righting moment, not mast length. But a rule of thumb is minimum 10% of the overall length. This applies to beams, rudders and masts. Less than this is possible (we have gone as low as 7%, but the item and bearings need a lot of reinforcing. Struts are great, but be careful with the attachment points.
Bucket List's deck is flat because we were not sure how well the build method would deal with peaked decks. The production ones will be peaked and, based on how the prototype goes, much lower. The cruisers have flat decks for access reasons and because they will rarely if ever go through waves..
To me, the rudder/daggerboard question is more about safety than anything else. If you hit something, they must kick up. If you have to run up a beach, or ride out a storm, it is essential you have nothing beneath the hulls. Secondarily, the 2 rudders, no daggerboard arrangement allows more balance flexibility, bigger rudders for more control at slow speeds (ie getting going after a shunt) and no holes below the water. When the in hull beefing up is included, they are much lighter than rudders which have to withstand impacts.
On Elementarry, it is quite noticable when sailing upwind that the boat sails more nose down with both rudders down and is slower than with just the aft rudder. I expect to get a lot more data on this when BL is sailing.
The answers to your 40F questions:
Very Interesting !It seem that there is enough height to sit on the bed ?
Over a metre. Essential if you are doing more than just sleeping on the bunk. This was one of the many carefully considered criteria specified by Gardner, for whom this boat was drawn and without whom, many of the unique solutions to the problems would never have evolved. It has been a long process (several years, probably a thousand emails), but worth every minute and key depression!
I like that ! I have been on cat that had more coffin then bed ...Toybox is the step between the 2 winches ?
No, it is the area between the seats and the tender.
Since no folding lw hull, then it is just below 40 ft ?
yes. Could add folding bows easily enough, if required.
Look like a hard deck between the saloon and tender or is it a solid fabric trampoline ?
Toy box lid.
When folding is there some system to keep both hull parallel ?
No. It is not meant to be motored part folded, so this was deemed unnecessary. A line will keep the 2 hulls together and paralell when fully folded.
How much do you think it would weight (bare functional boat and basic fridge and stove ) ?What is the design full displacement ?
Specs (will be on the web page soon).
Specs:
Metric
Metric
Length Overall: 12m
Beam Overall: 6m
Length Windward Hull: 9m
Draft Boards up: 250mm
Draft Boards Down: 1.1m
Sail Area: 60 sq m
Weight of composites: 820 kgs
Weight ready to sail: 1,000 kgs
Payload: 1,000 kgs (This can be increased if the excess goes in the lee hull)
Bruce Number at full payload: 0.61
Materials List (inc masts, beams, rudders and booms. Does not include wastage, paint, consumables or safety gear)
Materials List (inc masts, beams, rudders and booms. Does not include wastage, paint, consumables or safety gear)
400 gsm double bias fibreglass: 406 sq m
600 double bias fibreglass 180 sq m
440 gsm unidirectional fibreglass: 38 sq m
300 gsm uni carbon: 251 sq m
6 mm H80 foam: 9 sq m
12 mm H80 foam: 58 sq m
15 mm H80 foam: 32 sq m
20 mm H80 foam: 82 sq m
25 mm H80 foam: 19 sq m
12 mm H80 foam: 58 sq m
15 mm H80 foam: 32 sq m
20 mm H80 foam: 82 sq m
25 mm H80 foam: 19 sq m
Epoxy or methacrylate glue: 25 kgs
Carbon tow: 1 kg
Infusion resin: 178 kgs
Imperial
Length Overall: 40'
Beam Overall: 20'
Length Windward Hull: 30'
Draft Boards up: 10"
Draft Boards Down: 44"
Sail Area: 645 sq'
Weight of composites:1,800 lbs
Weight ready to sail: 2,200 lbs
Payload: 2,200 lbs (This can be increased if the excess goes in the lee hull)
Bruce Number at full payload: 1.5Materials List (inc masts, beams, rudders and booms. Does not include wastage, paint, consumables or safety gear)
12 ounce double bias fibreglass: 4,360 sq'
18 ounce double bias fibreglass 200 sq'
13 ounce unidirectional fibreglass: 410 sq'
9 ounce uni carbon: 2,700 sq'
1/4" H80 foam: 97 sq'
1/2" H80 foam: 630 sq'
5/8" H80 foam: 350 sq'
3/4" H80 foam: 880 sq'
1" H80 foam: 205 sq'
1/2" H80 foam: 630 sq'
5/8" H80 foam: 350 sq'
3/4" H80 foam: 880 sq'
1" H80 foam: 205 sq'
Epoxy or methacrylate glue: 55 lbs
Carbon tow: 2.5 lbs
Infusion resin: 390 lbsRough estimate of how much time it would take to put on a trailer ?
As with everything, the devil is in the detail. The tenth time will be a lot quicker than the first. The folded boat is 3.6m/12' wide. Putting this on the trailer for short distances will be very quick. Unstep the masts, remove the tender and fold is all that is necessary in terms of boat prep to get it on the trailer. Floating or winching it on is no big deal. Maybe an hour all up. Taking it apart to get it to road legal width is probably an afternoons work for 2 people.
I guess the lw hull and the tender goes sideway under the saloon ?
For road legal, yes.
Thanks!
My pleasure. been a busy couple of weeks!
rob
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Posted by: Rob Denney <harryproa@gmail.com>
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